[R] filling a matrix with data

[aw2471 at bristol.ac.uk]

Hi,

I've extracted netcdf data in R, and am trying to output it in a matrix
format.  I can make the matrix, and I have the data, but I can't get the
matrix to include the data...

I'm not very experienced at using R, so please forgive the crudeness of
these codes...

# For the matrix

 wind_dir_data<-matrix( NA, 17, 365 , byrow = FALSE )

 wind_speed_data<-matrix( NA, 17, 365, byrow = FALSE )

# to put the data into the matrix

 wind_dir_data[level, ]<-wind_dir_corrected
 
 wind_speed_data[level, ]<-rwind

#This is the response from R: "Error in "[<-"(`*tmp*`, level, , value =
c(-0.889991788193583, -1.45999177545309,  : 
	number of items to replace is not a multiple of replacement length"


If I try to call the data using wind_dir_data[1, ], i get a matrix full
of NA, so the data hasn't transferred.  

Does anyone know what I'm doing wrong?

Many thanks,

Amy